We searched for the cheapest flight from Dulles to Madrid for a date in late November, using aggregator sites and the "Big Three" booking agents.
AGGREGATORS:
Cheapflights.com $389
(Alitalia, via Milan)
Farechase.com $498.20
(US Airways, via Philadelphia)
Kayak.com $489
(US Airways, via Philadelphia)
Mobissimo.com $401.62
(Alitalia, via Milan)
Qixo.com $489
(Alitalia, via Milan)
Sidestep.com $514
(British Airways, via London)
